Bolt hole drilling jig for elevator installation

ABSTRACT

This precision drilling jig has a base with a flat bottom surface adapted to rest upon the flat top surface of an elevator car sill and a locating rib fitting into a groove in the sill. An angle arm is secured to the forward portion of the base and extends downward therefrom beneath the car platform carrying the sill and has a clamping screw movable upward into clamping engagement with the car platform. Pivotally mounted on the forward portion of the base to swing upward from a horizontal position coextensive therewith is a drilling arm containing a plurality of precisely located holes in which are mounted drilling bushings for precisely guiding the drill which drills the bolt holes in the elevator shaft entrance sill footing of the building floor for the subsequent bolting thereto of two laterally-spaced unfolded Z-brackets to which in turn is bolted the stationary elevator shaft entrance door sill.

United States Patent Loomis BOLT HOLE DRILLING .HG FOR ELEVATOR INSTALLATION 3,685,916 1 Aug. 22, 1972 Primary Examiner-Gil Weidenfeld Attorney-Barthel & Bugbee [72] Inventor: Charles M. Loomis, PO. Box 453,

Arkansas City, Kilns. 67005 [571 ABSTRACT 22 H d: March 12 1971 This precision drilling jig has a base with a flat bottom 1 1e surface adapted to rest upon the flat top surface of an PP N04 123,605 elevator car sill and a locating rib fitting into a groove in the sill. An angle arm is secured to the forward por- Remed Application tion of the base and extends downward therefrom DiViSiOn 0f l970- beneath the car platform carrying the sill and has a clamping screw movable upward into clamping en- U.S. gageme n the car platfornm mouned on [5 l 1 Cl. the forward portion of the base to wing upward from [58] Field of Search ..408/72, [03, 241, l 15; a horizontal position coextensive therewith is a m n 33/180 [89 arm containing a plurality of precisely located holes in which are mounted drilling bushings for precisely i561 Meme CW1 guiding the drill which drills the bolt holes in the UNITED STATES PATENTS elevator shaft entrance si ll footing of the building floor for the subsequent bolting thereto of two laterallyi i i x to in tum is 2,990,733 7/1961 Garcia ..408/72 the Stationary ekvator h f entrance door m 3,046,818 7/1962 Saha ..408/l03 3 Claim, 2 Drawing Figures llfFf I96 LL \l/ yr/a k I96 /44 H9 LUZ? F i/32 g gg fi I90 M641 w r'jhw |u-- M5 M2 M6 53 la va PAIENTI-ibwsz m2 mm; w? 5 NJ? INVENTOR CHARLES M. LOOMlS BY 6W ATTORNEYS BOLT HOLE DRILLING JIG FOR ELEVATOR. INSTALLATION This is a division of my copending application, Ser. No. 3,335, filed Jan. 16, 1970 for Universal Elevator Shaft Entrance Construction.

SUMMARY OF INVENTION This swinging drilling jig enables the drilling of the elevator shaft entrance sill footings in precisely-located positions to receive the bolts by which the shaft entrance sill supporting brackets are mounted, with reference to the location of the elevator car sill so as to provide a minimum yet adequate clearance therebetween. The drilling bushings of the drilling jig are mounted in a vertically-swinging arm so as to be capable of swinging upward out of the way when the elevator car is moved upward or downward in the elevator shaft.

In the drawing,

FIG. 1 is a top plan view of a swinging drilling jig, according to one form of the invention, shown as attached to a portion of an elevator car sill and supporting platform; and

FIg. 2 is a side elevation of the drilling jig shown in FIG. 1, with a portion of the elevator car sill and a portion of the elevator shaft entrance sill footing shown in vertical section, with the operating position of the drilling arm shown in solid lines resting upon the elevator shaft entrance sill footing, and with its partially raised position shown in dotted lines.

Referring to the drawing in detail, FIG. 1 shows an elevator shaft or hatchway entrance with a horizontal sill footing 20 forming a part of the building floor 22, which is usually, and preferably, of reinforced concrete. The elevator shaft entrance footing 20 is to be drilled with two sets of laterally-spaced bolt holes in precisely-located positions for receiving the bolts by which two unfolded Z-brackets (not shown) are to be mounted for supporting, in turn, the elevator entrance sill (not shown) at a minimum yet adequate clearance with respect to the elevator car sill 150. Such precision is required so that the elevator car sill 150 will pass sufficiently close to the doorway entrance sill (not shown) to prevent the occurrence of an unsightly and possibly dangerous gap therebetween and yet have adequate clearance relatively thereto. For this purpose, the present invention provides a precision swinging drilling jig 144 which is shown in FIGS. 1 and 2. This drilling jig is adapted to be precisely and firmly secured to the elevator car sill 146 and elevator car platform 152 with reference to a longitudinal groove 148 formed precisely in the car sill 146 at a definite distance from the front edge 150 of the car sill 146, which is mounted on the car platform 152 with its front edge 150 aligned with front face 154 of the platform 152. The drilling jig 144 is provided with a base 156 which has a fiat bottom surface 158 adapted to engage and rest upon the correspondingly flat top surface 160 of the elevator car sill 146. Secured to the base 156 and projecting downward therefrom is a transversely-disposed locating rib 162, the opposite ends of which project beyond the opposite sides of the base 156. Formed in the base 156 near the forward end thereof is a bore 164 (FIG. 1) of roundedend rectangular cross-section in which the correspondingly-shaped upper end 166 of a right-angled clamping arm 168 is secured as by a cross pin 170 (FIG. 2). The lower end of the clamping arm 168 is bored and threaded to receive a clamping screw 172 having at its upper end a clamping pad 174 and at its lower end a head 176 to which is attached an operating handle 178.

The forward end 180 of the base 156 is notched out at 182 near its opposite sides to receive and provide clearance for the integral tongues 184 of a verticallyswinging drilling jig arm 186, with stop shoulders 185 thereon adapted to abuttingly engage the forward end 180. The tongues 184 are spaced apart laterally from one another so as to lie on opposite sides of the nose portion 188 of the base 156 formed between the notches 182. The tongues 184 and the nose portion 188 are drilled to receive a pivot pin 190 for the arm 186 which is drilled precisely at four different locations in two spaced rows to receive drilling bushings 192, 194, 196 and 198 in one row and bushings 193, 195, 197 and 199 in the other row to drill right-hand or left-hand door openings respectively. The drilling bushings 194 and 198 are used when the elevator car sill 146 has a single guide groove 148 for a single door 140 as shown in FIG. 2. Where the elevator car has double doors (not shown) and the elevator car sill 146 consequently has double parallel guide grooves 148, the drilling bushings 192 and 196 are used to drill the bolt holes 29 and 31. The drilling jigs 144 are used in pairs and located on the elevator car platform by a template (not shown) prepared for the particular installation and afterward discarded.

In the installation of the elevator shaft entrance sill (not shown), the two drilling jigs 144 are positioned by a suitable template (not shown) in their proper locations on the car platform 152 and secured by their clamping screws 172 to the elevator car sill and platform 152 with their locating ribs 162 in the car sill guide groove 148. When the elevator car is to be moved upward or downward between floors, the jig arms 186 are swung upward out of the way in the direction of the dotted lines in FIG. 8, but preferably into a vertical or backwardly-tilted position. In use, the arms 186 are swung downward until their stop surfaces 185 engage the forward end 180 of the base 156. The installer inserts the drill of a suitable portable drilling appliance through the proper drilling bushings 192, 196 or 194, 198, depending upon whether the entrance construction 10 has a single track sill or a double track sill for single or double sliding doors respectively or through the bushings 193, 197 or 195, 199 for a door opening of the opposite hand. After having drilled the bolt holes in this manner for one of the Z-braclcets (not shown), the installer then places a pair of the Z- brackets with their bolt holes in alignment with the bolt holes, inserts bolts therein and bolts the two Z-brackets firmly and fixedly in their intended positions. He then moves the elevator car to the next floor 20 of the building, repeats the above-described drilling operations there, and bolts down the next pair of Z-brackets, and so on, repeating these operations at each of the remaining floors of the building in that particular elevator shaft. Once the two drilling jigs 144 have been clamped in their proper positions on the elevator car platform 152, it is self-evident that they do not need to be removed therefrom until the completion of the installation of all the Z-brackets in that particular shaft. The

above-described procedure is then repeated, shaft by shaft, until the installation of all Z-brackets for all floors of all elevator shafts of the building has been completed. The remainder of the installation is then carried out, as set forth in detail in my co-pending application, Ser. No. 3,335 filed Jan. I6, 1970 referred to above.

lclaim:

l. A bolt hole drilling jig for removable attachment to the platform structure of an elevator car for guiding the drilling of sill support bracket bolt holes in the building floor adjacent the doorway, said drilling jig comprising a base adapted to rest upon the elevator car platform structure and having a clamping device secured to said base and adapted to engage the platform beneath the same,

and a drill guide arm pivotally attached to said base and extending outwardly away from said base and clamping device for swinging upward relatively thereto and having drill guide holes extending through the outer end portion of said arm remote from said base and clamping device.

2. A bolt hole drilling jig for removable attachment to the platform structure of an elevator car for guiding the drilling of sill support bracket bolt holes in the building floor adjacent the doorway, said drilling jig comprising a base adapted to rest upon the elevator car platform structure and having a clamping device secured to said base and adapted to engage the platform beneath the same,

and a drill guide arm pivotally attached to said base for swinging upward relatively thereto and having drill guide holes extending therethrough,

said base on the under side thereof having downwardly-projecting jig-locating means adapted to interfit with a cooperating locating recess on the elevator car platform structure.

3. A bolt hole drilling jig, according to claim 2, wherein said jig-locating means includes an elongated member, and wherein the locating recess is an elongated groove adapted to snugly receive said elongated member. 

1. A bolt hole drilling jig for removable attachment to the platform structure of an elevator car for guiding the drilling of sill support bracket bolt holes in the building floor adjacent the doorway, said drilling jig comprising a base adapted to rest upon the elevator car platform structure and having a clamping device secured to said base and adapted to engage the platform beneath the same, and a drill guide arm pivotally attached to said base and extending outwardly away from said base and clamping device for swinging upward relatively thereto and having drill guide holes extending through the outer end portion of said arm remote from said base and clamping device.
 2. A bolt hole drilling jig for removable attachment to the platform structure of an elevator car for guiding the drilling of sill support bracket bolt holes in the building floor adjacent the doorway, said drilling jig comprising a base adapted to rest upon the elevator car platform structure and having a clamping device secured to said base and adapted to engage the platform beneath the same, and a drill guide arm pivotally attached to said base for swinging upward relatively thereto and having drill guide holes extending therethrough, said base on the under side thereof having downwardly-projecting jig-locating means adapted to interfit with a cooperating locating recess on the elevator car platform structure.
 3. A bolt hole drilling jig, according to claim 2, wherein said jig-locating means includes an elongated member, and wherein the locating recess is an elongated groove adapted to snugly receive said elongated member. 